Stats

Question 1

Formulas provided vs recall

Answer 1

Question 2

Circumference of a circle

Answer 2

2piR

Question 3

% error (uncertainty) formula

Answer 3

( 2 x absolute uncertainty / quantity measured ) X 100

Question 4

Magnification formula

Answer 4

size of image / size of real object

Question 5

Rf formula

Answer 5

Question 6

Surface area to volume ratio formula

Answer 6

Question 7

Genetic biodiversity formula

Answer 7

Question 8

Cardiac output formula

Answer 8

cardiac output = heart rate × stroke volume

Question 9

Respiratory quotient

Answer 9

Question 10

Microorganism population growth formula

Answer 10

Question 11

Efficiency of biomass transfer formula

Answer 11

Question 12

Temperature coefficient (Q10)

Answer 12

Question 13

Chi squared - provided

Answer 13

Question 14

Spearman’s rank correlation coefficient - provided

Answer 14

Question 15

Standard deviation - provided

Answer 15

Question 16

Students t Test - unpaired - provided

Answer 16

Question 17

Students T Test - paired - provided

Answer 17

Question 18

Simpsons Index - provided

Answer 18

Question 19

Why is standard deviation a better measure of spread than range

Answer 19

Less effected by extreme values

Question 20

What is the null hypothesis

Answer 20

There is no significance difference between….the things you are measuring

Question 21

What does the chi-squared test look at

Answer 21

Differences in frequencies between groups

Question 22

Degrees of freedom for chi squared

Answer 22

Number of classes - 1

Question 23

How to tell if your chi squared values are significant

Answer 23

If my value is greater than or equal to the critical value = it is significant = reject null hypothesis

If my value is less than the critical value = not significant = can’t reject null hypothesis

Question 24

When to use a chi squared test

Answer 24

• data is about frequency’s for different categories
• each person / thing only appears once in the results

Categorical + independent

Question 25

How to work out expected frequency in chi squared if there is more then one row / column

Answer 25

Can’t just distribute evenly

(Row total X column total) / overall total